Garden & Water Utilities
Irrigation Runtime & Water-Use Calculator
Estimate the water volume and runtime needed to apply a target depth over an area, then see the weekly use for your planned schedule.
Measure, then tune seasonally
The estimate uses area × target depth ÷ delivery efficiency ÷ measured flow. Soil, slope, plant needs, weather, pressure and runoff can change the result, so split long runs into cycles when water starts to move off site.
Source: Colorado State University Extension, Operating and Maintaining a Home Irrigation System (published 2003, reviewed August 2025; accessed 2026-09-29).